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A quote from Newwoodworker.com: I normally do not apply a finish to my trivets but some do. It is important to not to use wax-based finishes, as they will transfer to the bottom of hot pots placed on it. A good quality, food-safe (Salad Bowl Finish), allowed to dry completely before use should provide the protection needed.

-- You can discover more about a person in an hour of play than in a year of conversation. (Plato)